<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }"
                >首页</el-breadcrumb-item
            >
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <!-- eslint-disable-next-line -->
                    <template slot-scope="scope"> 
                        <el-row
                            :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                            v-for="(item1, i1) in scope.row.children"
                            :key="item1.id"
                        >
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag
                                    closable
                                    @close="removeRightById(scope.row, item1.id)"
                                >
                                    {{ item1.authName }}
                                </el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过 for 循环 嵌套渲染二级权限 -->
                                <el-row
                                    :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                                    v-for="(item2, i2) in item1.children"
                                    :key="item2.id"
                                >
                                    <!-- 二级菜单 -->
                                    <el-col :span="6">
                                        <el-tag
                                            type="success"
                                            closable
                                            @close="removeRightById(scope.row, item2.id)"
                                        >
                                            {{ item2.authName }}
                                        </el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 三级菜单 -->
                                    <el-col :span="18">
                                        <el-tag
                                            type="warning"
                                            v-for="(item3) in item2.children"
                                            :key="item3.id"
                                            closable
                                            @close="removeRightById(scope.row, item3.id)"
                                        >
                                            {{ item3.authName }}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- Json数据结构 -->
                        <!-- <pre>
                            {{ scope.row }}
                        </pre> -->
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column label="#" type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="320px">
                    <!-- eslint-disable-next-line -->
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting"
                            @click="showSetRightDialog(scope.row)"
                        >分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="600px"
            @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree
                :data="rightslist"
                :props="treeProps"
                show-checkbox
                node-key="id"
                default-expand-all
                :default-checked-keys="defKeys"
                ref="treeRef"
            ></el-tree>
            <!-- 按钮 -->
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取消</el-button>
                <el-button type="primary" @click="allotRights">确定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolelist: [],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightslist: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点Id值数组
            defKeys: [],
            // 当前即将分配权限的角色id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        // 获取所有角色的列表
        async getRolesList() {
            const { data: res } = await this.$http.get('roles')
            if (res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败!!!')
            }
            this.rolelist = res.data
            console.log(this.rolelist)
        },
        // 弹框提示用户是否要删除
        // 根据ID删除对应的权限
        async removeRightById(role, rightId) {
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') {
                return this.$message.info('取消了删除!!!')
            }
            // console.log('确认了删除!!!')
            const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除权限失败!!!')
            }
            // 不要调用这个，因为会全局刷新
            // this.getRolesList()
            // 把数据返回的最新权限直接赋值给当前的children属性
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有权限的数据
            const { data: res } = await this.$http.get('rights/tree')
            if (res.meta.status !== 200) {
                return this.$message.error('获取权限数据失败!!!')
            }
            // 把获取到的权限数据保存到 data 中
            this.rightslist = res.data
            console.log(this.rightslist)

            // 递归获取三级节点的ID
            this.getLeafKeys(role, this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys数组中
        getLeafKeys(node, arr) {
            // 如果当前node节点不包含children属性，则是三级节点
            if (!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            // console.log(keys)

            const idStr = keys.join(',')
            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })

            if (res.meta.status !== 200) {
                return this.$message.error('分配权限失败!!!')
            }
            this.$message.success('分配权限成功!!!')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}

.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>